João Miranda knows a lot about smoke.
He has proved it with his previous smoke devices such as his smoke watch that has been a huge success.
Now he comes back with Smoke Cube which is a tiny device that produces a huge amount of smoke and can be palmed or ditched using a pull.
The delayed activation (up to 20 seconds) can be programmed by the magician to allow a hands free operation and the cube even vibrates right before its smoke production.

More info:
https://www.murphysmagic.com/product.aspx?id=61796